基于电磁辐射数据的小波变换理论,对青海玉树7.1级地震前后四川都江堰、剑阁、江油及郑州二砂电磁波台站的观测数据进行了小波分析,研究发现玉树地震前有异常信息存在,表现为:地震前电磁辐射异常信号低频部分出现的时间较早；距震中较近的台站,异常信息出现的频率段较高；距震中稍远的台站,异常信息的频率段较低；震中距越大,异常出现的时间越晚.%By use of the wavelet analysis, the electromagnetic radiation data of the Yushu earthquake magnitude 7. 1 in Qinghai province near Dujiangyan, Jiange, Jiangyou stations in Sichuan and Ersha station in Zhengzhou before and after the event, were studied in the different scales of wavelet detail decomposition and then it is found that there are anomalous information before the earthquake, and had interpretated preliminarily. The results show that, the first, the details of the wavelet decomposition show abnormal electromagnetic wave signal of low frequency before the earthquake portion of the earlier time; epicenter close to the station, the information that appears anomay in high frequency band; a little far from the epicenter of the station, the anomay in low frequency band information. The second, along with the epicentral distance increases, the smaller the radiation energy, the anomalies appear later.
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